Model G0726 (Mfg. Since 7/11)
-53-
Adjusting Backlash
Leadscrew backlash is the amount of free play in
the leadscrew when changing direction of table
movement. Leadscrews always have a certain
amount of backlash that will increase with wear.
Generally, 0.005"–0.010" of backlash is accept-
able.
Tools Needed
Qty
Phillips Screwdriver ........................................... 1
Wrench 19mm ................................................... 1
Hex Wrench 5mm .............................................. 1
To adjust Y-axis leadscrew backlash:
1. DISCONNECT MILL FROM POWER!
2. Remove front way cover, move table all
the way back, then remove ball handle and
keyed spacers from Y-axis feed leadscrew.
3. Remove graduated dial assembly, key, and
remaining spacers from leadscrew.
Note: Keep track of small parts as you take
them off, and note the order of assembly.
4. Remove the two cap screws that hold
power feed unit to the bearing bracket (see
Figure 73).
Figure 73. Power feed secured to bearing
bracket.
Cap Screws
Front
Cover
Bearing
Bracket
5. Carefully slide power feed unit off leadscrew
and lay it aside, then remove front cover from
the table.
6. Loosen the two cap screws on leadscrew nut
shown in
Figure 74, then rotate adjustment
plate in small increments.
7. Re-install key and ball handle onto leadscrew,
then test backlash by rocking handle back-
and-forth.
8. When you are satisfied with the amount of
backlash, re-tighten adjustment plate cap
screws.
9. Make sure all surfaces are clean of debris,
then re-install components removed for this
procedure.
The X-axis leadscrew backlash is adjusted in the
same manner. Refer to
Figure 75 for the location
of the X-axis backlash adjustment plate as viewed
from the left underside of the table.
Figure 75. X-axis backlash adjustment plate.
Adjustment Plate
Figure 74. Y-axis feed leadscrew nut and
backlash adjustment plate.
Leadscrew Nut
Cap Screws
Adjustment
Plate